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How to update data on the main thread after running code in the background?


How to update data on the main thread after running code in the background?

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How to update data on the main thread after running code in the background?
Tag : iphone , By : dexteryy
Date : November 24 2020, 05:47 AM


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Can code running in a background thread be faster than in the main VCL thread in Delphi?


Tag : multithreading , By : nd27182
Date : March 29 2020, 07:55 AM
hope this fix your issue Without simple source code to reproduce the issue, and how you are timing your threads, it will be difficult to understand what occurs in your software.
Sounds definitively like either:

Core Data - update entity in background thread automatically changes NSManagedObject in Main Thread without merging- why


Tag : ios , By : Ken
Date : March 29 2020, 07:55 AM
Does that help By default, a fetch request will return objects as faults so their content is not actually loaded until you access it (you can learn more about faulting under this link).
To see your expected behavior, try logging the original value of t1.testDescription before you start the second thread.
self.context.returnObjectsAsFaults = NO;

Running code in main thread in background thread while blocking background thread


Tag : android , By : user135518
Date : March 29 2020, 07:55 AM
this one helps. You will need to use a Java pattern called wait/notify. Simply put: it defines two threads, a producer and a consumer, so that the consumer, after initiating the producer, stops and waits until the producer thread has completed.
It goes like this:
static final object uiActionMonitor = new Object();
transient boolean uiCompleted;

void network_thread_run() {

    int numRead = 0;
    while ((numRead = stream.read(bytes)) >= 0) {
        String s = new String(bytes, 0, numRead);

    // This should be synchronised call
    uiCompleted = false;
    runOnMainThread();

    synchronized(uiActionMonitor) {  //<---------- wait for UI to complete
       while (!uiCompleted) {
            uiActionMonitor.wait();
       }
    }

}
private void runOnMainThread() {
    new Handler(Looper.getMainLooper()).post(new Runnable() {

        @Override
        public void run() {
            // Do something

            // End do something
            uiCompleted = true;
            synchronized(uiActionMonitor) {  //<---------- release networking thread
                uiActionMonitor.notifyAll();                 
            }
        }
    });
}

How to stop execution of a running background thread from main thread on swift while using DispatchQueue


Tag : ios , By : THD
Date : March 29 2020, 07:55 AM
it helps some times I think the best solution is to execute DispatchWorkItem in async:
let workItem = DispatchWorkItem {
   //.... writing stuff in background ....

   DispatchQueue.main.async {
      //.... done writing stuff, updating ui ....
   }
}
DispatchQueue.global().async(execute: workItem)
//.... but, if stuff goes wrong ....
DispatchQueue.main.async {
   workItem.cancel()
}

How do I use a background thread to shut down (on detecting a key press) a main thread running a loop?


Tag : python , By : joshboles
Date : March 29 2020, 07:55 AM
should help you out I'm trying to automate the following: open calculator, close it by clicking on the red x. To stop this script, I want it to detect when the escape key is pressed, and then stop the script execution. , You can use the os._exit method to exit the entire process:
import os

def on_release(key):
    if str(key) == 'Key.esc':
        print('Exiting')
        os._exit(0)
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